Gaseous electric discharge lamp



Aug. 18, 1959 w. A. PENNOW GASEOUS ELECTRIC DISCHARGE LAMP Filed May 19, 1955 INVENTOR MAL/J ,4. Dav/vow 14TT0R 7 United States Patent 2,900,552 GASEOUS ELECTRIC DISCHARGE LAMP Willis A. Pennow, Cleveland, Ohio, assignor, by mesne assignments, to the United States of America as represented by the Secretary of the Navy Application May 19, 1955, Serial No. 509,701 3 Claims. (Cl. 313-220) This invention concerns gaseous electric discharge lamps. V

The principal object of this invention is the provision of an improved gaseous electric discharge lamp.

An object of this invention is the provision of a gaseous electric discharge lamp adapted for mounting in accurate optical systems.

An object of this invention is the provision of a gaseous electric discharge lamp adapted for rapid insertion in and removal from an energizing system.

An object of this invention is the provision of a gaseous electric discharge lamp having an uninterrupted source-emitted light flux.

An object of this invention is the provision of a gaseous electric discharge lamp adapted for mounting in a rotating mechanism.

An object of this invention is the provision of a gaseous electric discharge lamp having increased life and constant intensity.

Another object of this invention is the provision of a gaseous electric discharge lamp of enhanced strength and simple construction.

Other objects and many of the attendant advantages of this invention will be readily appreciated as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings wherein:

The figure is a schematic presentation of the gaseous electric discharge lamp of the present invention.

The quartz envelope 1 is of a type known in the art of high wattage mercury vapor lamps and houses a set of electrodes 2 and 3 of a type known in the art. The electrodes 2 and 3 are so positioned within the envelope 1 that the area of useful flux emission produced by the gaseous electric discharge lamp is defined by the axes 4 and 5 in the plane of the figure. The electrode 2 is electrically connected to the terminal 6 and the electrode 3 is electrically connected to the terminal 7.

The terminals 6 and 7 are fused to the lead-in wires to the electrodes 2 and 3 adjacent the ends of the quartz seal members 8 and 9, respectively, and aflixed to said seal members. The terminals 6 and 7 are of solid cylindrical configuration adapted to be held by quick-detachable clamps from a source of electric power (not shown in the figure). The terminals 6 and 7 are coaxial with the major axis 12 of the envelope 1.

The evacuating seal 10 of the envelope 1 is of a type known in the art of high wattage mercury vapor lamps. The evacuating seal 10 is positioned on the surface of the envelope 1 within the area bounded by a cone formed by the revolution of a straight line, represented by the line 11 in the plane of the figure, which is always tangential to the surface of said envelope and to the terminal 7, about the major axis 12 of said envelope. The evacuating seal may, of course, be positioned on the surface of the envelope 1 within the area bounded by a cone formed by the revolution of a straight line, which is always tangential to the surface of said envelope and to the terminal 6, about the major axis 12 of said envelope.

This protects the evacuating seal 10 from accidental breakage.

To permit the gaseous electric discharge lamp to produce an uninterrupted light flux, the evacuating seal 10 I 2,900,552 Patented Aug. 18, 1959 ICC is positioned on the surface of the envelope 1 outside the area bounded by the cones formed by the axes of revolution 4 and 5. The cones formed by the axes of revolution 4 and 5 approximately define the area of useful flux emission.

The annular positioning rings 13 and 14 are mounted on the seal members 8 and 9, respectively; they are coaxial with the major axis 12 of the envelope 1. The positioning rings 13 and 14 are preferably secured to the seal members 8 and 9, respectively, by any suitable high temperature cement compound known in the art. The positioning rings 13 and 14 permit the mounting of the gaseous electric discharge lamp in accurate optical systems and in rotating mechanisms.

The positioning ring 13 has an integral flange 15 at one base to permit more exact positioning of the gaseous electric discharge lamp in accurate optical systems.

Obviously many modifications and variations of the present invention are possible in the light of the above teachings. .It is therefore to be understood that within the scope of the appended claims the invention may be practiced otherwise than as specifically described.

I claim:

1. A gaseous electric discharge lamp comprising; an envelope of transparent insulating material having a bulbous portion and a pair of oppositely extending, axially aligned and elongated narrow extensions integral therewith; a pair of electrodes spaced apart at the center of the bulbous portion of said envelope and coaxial with said extensions of said envelope; the free end of each extension having a terminal connector; conductor means connecting each of said electrodes to a terminal connector at the free end of a respective one of the aligned extensions of said envelope; an annular positioning ring surrounding and secured to each of said extensions intermediate of the ends of each of the aligned extensions of said envelope and spaced a predetermined and substantial distance from said electrodes and from the adjacent terminal connector.

2. A gaseous electric discharge lamp as defined in claim 1 wherein at least one of said positioning rings terminates in a locating, external peripheral flange.

3. A gaseous electric discharge lamp comprising; an envelope having a bulbous portion and a pair of oppositely extending axially aligned narrow extensions integral therewith; a pair of electrodes within and spaced apart adjacent the center of the bulbous portion of said envelope and coaxial with the extensions of said envelope; an external metal connector on the free end of each of said extensions; conductor means connecting each of said electrodes to the metal connector at the free end of the adjacent aligned extension of said envelope; an annular positioning ring, surrounding and secured to each said extension intermediate of its ends and spaced a predetermined distance from said electrodes and a substantial distance from the metal connector on the free end of that extension, at least one of said positioning rings terminating in an external, peripheral locating flange by which said lamp may be accurately located in a mounting in an optical system; the bulbous portion of said envelope having an evacuation seal nearer one of the aligned narrow extensions than it is to the central transverse periphw cry of the bulbous part of said envelope; whereby it does not interfere with the useful flux emision from said envelope and if the envelope is rolled on a flat surface,

the evacuation seal will not touch the flat surface.

References Cited in the file of this patent UNITED STATES PATENTS Anderson Apr. 26, 19 55 

